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San Juan Weather in August: Higher Risk of Rain

San Juan weather in August
Average high temperature and rainfall for San Juan in August. © 2021 Scott S. Bateman

San Juan weather in August has the hottest weather of the year along with a high risk of rain.

The San Juan cruise port is a popular port of call for eastern Caribbean cruises. Its popularity is the result of a convenient location in the Caribbean as well as major tourist attractions such as Old San Juan.

San Juan Temperatures in August

San Juan temperatures in August have an average daytime high of 89 degrees Fahrenheit or 31 Celsius, according to the U.S. National Weather Service. Nighttime low temperatures average 77 Fahrenheit or 25 Celsius.

August temperatures are the highest of the year along with June, July, September and October. By comparison, daytime temperatures reach a low point of 83 degrees Fahrenheit in January.

Water temperatures will hover in the high 70s to low 80s Fahrenheit depending on the time of day.

Rainy Season in August

This video explains Caribbean weather in August and which islands are the best and worst to visit for weather.

Full-Screen Version | YouTube Caribbean Channel
August is the third official month of the annual Caribbean hurricane season. San Juan historically has higher rainfall in August than the dry season from January through April.

August rainfall historically is the highest of the year along with September through November with an average of five to six inches each month.

It also rains more often in August than earlier in the year. The total days with rain is 15 compared to eight to nine days from February through April.

San Juan weather in August is risky for vacationers because of more rain than usual. Anyone planning a Caribbean vacation in the summer that might include San Juan should consider going in June rather than August. July usually has less rain than August but more than June.

• San Juan weather in January - February - March - April - May - June - July - August - September - October - November - December

Scott S. Bateman is a professional journalist who has traveled widely throughout the Caribbean and the Americas. He is the author of four books about cruising in the Caribbean, Alaska and Mexican Riviera.
July 24, 2021

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